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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2012 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: IndentXMLEventWriter.html 813 2013-12-23 16:52:26Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.dellroad.stuff.xml;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.util.Arrays;<a name="line.10"></a>
<span class="sourceLineNo">011</span><a name="line.11"></a>
<span class="sourceLineNo">012</span>import javax.xml.stream.XMLEventFactory;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import javax.xml.stream.XMLEventReader;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import javax.xml.stream.XMLEventWriter;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import javax.xml.stream.XMLStreamException;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import javax.xml.stream.events.XMLEvent;<a name="line.16"></a>
<span class="sourceLineNo">017</span><a name="line.17"></a>
<span class="sourceLineNo">018</span>/**<a name="line.18"></a>
<span class="sourceLineNo">019</span> * Wrapper for an underlying {@link XMLEventWriter} that automatically adds indentation to the event stream.<a name="line.19"></a>
<span class="sourceLineNo">020</span> */<a name="line.20"></a>
<span class="sourceLineNo">021</span>public class IndentXMLEventWriter extends EventWriterDelegate {<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>    /**<a name="line.23"></a>
<span class="sourceLineNo">024</span>     * The configured event factory for this instance.<a name="line.24"></a>
<span class="sourceLineNo">025</span>     */<a name="line.25"></a>
<span class="sourceLineNo">026</span>    protected final XMLEventFactory factory;<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>    private final int indent;<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>    private int lastEvent = -1;<a name="line.30"></a>
<span class="sourceLineNo">031</span>    private int depth;<a name="line.31"></a>
<span class="sourceLineNo">032</span><a name="line.32"></a>
<span class="sourceLineNo">033</span>    /**<a name="line.33"></a>
<span class="sourceLineNo">034</span>     * Constructor.<a name="line.34"></a>
<span class="sourceLineNo">035</span>     *<a name="line.35"></a>
<span class="sourceLineNo">036</span>     * @param writer underlying writer<a name="line.36"></a>
<span class="sourceLineNo">037</span>     * @param factory event factory<a name="line.37"></a>
<span class="sourceLineNo">038</span>     * @param indent indent amount, or negative to not add any whitespace<a name="line.38"></a>
<span class="sourceLineNo">039</span>     * @throws IllegalArgumentException if {@code writer} or {@code factory} is null<a name="line.39"></a>
<span class="sourceLineNo">040</span>     */<a name="line.40"></a>
<span class="sourceLineNo">041</span>    public IndentXMLEventWriter(XMLEventWriter writer, XMLEventFactory factory, int indent) {<a name="line.41"></a>
<span class="sourceLineNo">042</span>        super(writer);<a name="line.42"></a>
<span class="sourceLineNo">043</span>        if (factory == null)<a name="line.43"></a>
<span class="sourceLineNo">044</span>            throw new IllegalArgumentException("null factory");<a name="line.44"></a>
<span class="sourceLineNo">045</span>        this.factory = factory;<a name="line.45"></a>
<span class="sourceLineNo">046</span>        this.indent = indent;<a name="line.46"></a>
<span class="sourceLineNo">047</span>    }<a name="line.47"></a>
<span class="sourceLineNo">048</span><a name="line.48"></a>
<span class="sourceLineNo">049</span>    /**<a name="line.49"></a>
<span class="sourceLineNo">050</span>     * Convenience constructor. Equivalent to:<a name="line.50"></a>
<span class="sourceLineNo">051</span>     * &lt;blockquote&gt;<a name="line.51"></a>
<span class="sourceLineNo">052</span>     *  {@link #IndentXMLEventWriter(XMLEventWriter, XMLEventFactory, int)<a name="line.52"></a>
<span class="sourceLineNo">053</span>     *      IndentXMLEventWriter(writer, XMLEventFactory.newFactory(), indent)}<a name="line.53"></a>
<span class="sourceLineNo">054</span>     * &lt;/blockquote&gt;<a name="line.54"></a>
<span class="sourceLineNo">055</span>     *<a name="line.55"></a>
<span class="sourceLineNo">056</span>     * @param writer underlying writer<a name="line.56"></a>
<span class="sourceLineNo">057</span>     * @param indent indent amount, or negative to not add any whitespace<a name="line.57"></a>
<span class="sourceLineNo">058</span>     * @throws IllegalArgumentException if {@code writer} or {@code factory} is null<a name="line.58"></a>
<span class="sourceLineNo">059</span>     */<a name="line.59"></a>
<span class="sourceLineNo">060</span>    public IndentXMLEventWriter(XMLEventWriter writer, int indent) {<a name="line.60"></a>
<span class="sourceLineNo">061</span>        this(writer, XMLEventFactory.newFactory(), indent);<a name="line.61"></a>
<span class="sourceLineNo">062</span>    }<a name="line.62"></a>
<span class="sourceLineNo">063</span><a name="line.63"></a>
<span class="sourceLineNo">064</span>    @Override<a name="line.64"></a>
<span class="sourceLineNo">065</span>    public void add(XMLEvent event) throws XMLStreamException {<a name="line.65"></a>
<span class="sourceLineNo">066</span>        switch (event.getEventType()) {<a name="line.66"></a>
<span class="sourceLineNo">067</span>        case XMLEvent.START_ELEMENT:<a name="line.67"></a>
<span class="sourceLineNo">068</span>            switch (lastEvent) {<a name="line.68"></a>
<span class="sourceLineNo">069</span>            case XMLEvent.START_ELEMENT:<a name="line.69"></a>
<span class="sourceLineNo">070</span>            case XMLEvent.END_ELEMENT:<a name="line.70"></a>
<span class="sourceLineNo">071</span>                this.indent(this.depth);<a name="line.71"></a>
<span class="sourceLineNo">072</span>                break;<a name="line.72"></a>
<span class="sourceLineNo">073</span>            default:<a name="line.73"></a>
<span class="sourceLineNo">074</span>                break;<a name="line.74"></a>
<span class="sourceLineNo">075</span>            }<a name="line.75"></a>
<span class="sourceLineNo">076</span>            this.depth++;<a name="line.76"></a>
<span class="sourceLineNo">077</span>            break;<a name="line.77"></a>
<span class="sourceLineNo">078</span>        case XMLEvent.END_ELEMENT:<a name="line.78"></a>
<span class="sourceLineNo">079</span>            this.depth--;<a name="line.79"></a>
<span class="sourceLineNo">080</span>            switch (lastEvent) {<a name="line.80"></a>
<span class="sourceLineNo">081</span>            case XMLEvent.START_ELEMENT:<a name="line.81"></a>
<span class="sourceLineNo">082</span>                break;<a name="line.82"></a>
<span class="sourceLineNo">083</span>            case XMLEvent.END_ELEMENT:<a name="line.83"></a>
<span class="sourceLineNo">084</span>                this.indent(this.depth);<a name="line.84"></a>
<span class="sourceLineNo">085</span>                break;<a name="line.85"></a>
<span class="sourceLineNo">086</span>            default:<a name="line.86"></a>
<span class="sourceLineNo">087</span>                break;<a name="line.87"></a>
<span class="sourceLineNo">088</span>            }<a name="line.88"></a>
<span class="sourceLineNo">089</span>            break;<a name="line.89"></a>
<span class="sourceLineNo">090</span>        default:<a name="line.90"></a>
<span class="sourceLineNo">091</span>            break;<a name="line.91"></a>
<span class="sourceLineNo">092</span>        }<a name="line.92"></a>
<span class="sourceLineNo">093</span>        this.lastEvent = event.getEventType();<a name="line.93"></a>
<span class="sourceLineNo">094</span>        super.add(event);<a name="line.94"></a>
<span class="sourceLineNo">095</span>    }<a name="line.95"></a>
<span class="sourceLineNo">096</span><a name="line.96"></a>
<span class="sourceLineNo">097</span>    @Override<a name="line.97"></a>
<span class="sourceLineNo">098</span>    public void add(XMLEventReader reader) throws XMLStreamException {<a name="line.98"></a>
<span class="sourceLineNo">099</span>        while (reader.hasNext())<a name="line.99"></a>
<span class="sourceLineNo">100</span>            this.add(reader.nextEvent());<a name="line.100"></a>
<span class="sourceLineNo">101</span>    }<a name="line.101"></a>
<span class="sourceLineNo">102</span><a name="line.102"></a>
<span class="sourceLineNo">103</span>    /**<a name="line.103"></a>
<span class="sourceLineNo">104</span>     * Emit a newline followed by indentation to the given depth.<a name="line.104"></a>
<span class="sourceLineNo">105</span>     */<a name="line.105"></a>
<span class="sourceLineNo">106</span>    protected void indent(int depth) throws XMLStreamException {<a name="line.106"></a>
<span class="sourceLineNo">107</span>        if (this.indent &lt; 0)<a name="line.107"></a>
<span class="sourceLineNo">108</span>            return;<a name="line.108"></a>
<span class="sourceLineNo">109</span>        char[] buf = new char[1 + depth * this.indent];<a name="line.109"></a>
<span class="sourceLineNo">110</span>        Arrays.fill(buf, ' ');<a name="line.110"></a>
<span class="sourceLineNo">111</span>        buf[0] = '\n';<a name="line.111"></a>
<span class="sourceLineNo">112</span>        super.add(this.factory.createIgnorableSpace(new String(buf)));<a name="line.112"></a>
<span class="sourceLineNo">113</span>    }<a name="line.113"></a>
<span class="sourceLineNo">114</span>}<a name="line.114"></a>
<span class="sourceLineNo">115</span><a name="line.115"></a>




























































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